Increased-Value Oxide Powders for Polymeric Fibrous Matrices with Tailored Surfaces for Clothing Wear Comfort: A Review

This review is dedicated to the area of renewable polymeric matrices, a topic in which the editors aims at conducting, developing, and forming a research-innovation direction for the doctoral studies school. There are two directions envisaging (a) the synthesis of cellulose-derived materials and (b) their application as novel clothing wear materials as an alternative to standard one. The evolution plans aspire to encourage theme-based cooperation between academic environment and industrial media. Thus, the intention is to work on new product development and formulation in a program with strong industry engagement. Specifically, the proposed review will focus closely on applied research and the expansion of the transfer of technology and knowledge in the clothing industries and beyond. Subsequently we propose an interdisciplinary research and development program for material sciences and technology development, meaning, development of new improved ecological comfort performance materials

Radiative Darcy-Forchheimer Micropler Bödewadt flow of CNTs with viscous dissipation effect

[EN] This article aims at the examination of the three-dimensional micropolar nanofluids of single and multi-walled carbon nanotubes (CNTs) dissolved in water and gasoline liquids for the first time reported to the case of so-called classical Bodewadt flow, which occurs when a fluid rotates at an adequate great distance out of a static disk. The static disk is then stretched linearly in the radial direction. The Darcy-Forchheimer porous media are also taken into account. Energy equation is investigated in existence of convection and radiation. The effect of viscous dissipation is also taken into account. The flow field equations are converted from PDEs to ODEs using appropriate transformation. The implementation of the bvp4c technique (Shooting scheme) is used to construct solutions to these ODEs. In addition to Nusselt number, skin friction, axial velocity, radial velocity, tangential velocity, micro-rotational velocities and fluid temperature are all investigated using physical factors. The finding indicates that the volume fraction enhanced, the micro-rotational velocities enhances. The tabulation outcomes indicates that the skin friction declined for escalating values of porosity parameter and volume fraction, while Nusselt number show opposite behavior. It has been also discovered that the effect of multiple-walled CNTs is quite effective than that of single-walled CNTs. When compared to water-based fluids, gasoline oil also displays an overarching trend.Project financed by Lucian Blag a University of Sibiu through research grant LBUS-IRG-2022-08.Shah, Z.; Rooman, M.; Asif Jan, M.; Vrinceanu, N.; Deebani, W.; Shutaywi, M.; Ferrándiz Bou, S. (2022). Radiative Darcy-Forchheimer Micropler Bödewadt flow of CNTs with viscous dissipation effect. Journal of Petroleum Science and Engineering. 217:1-11. https://doi.org/10.1016/j.petrol.2022.11085711121

Nanoparticle/biopolymer-based coatings for functionalization of textiles: recent developments (a minireview)

[EN] This minireview presents recent developments in surface nano-structured textiles and their biomedical applications by up-to-date achievements, summarizing the coatings made of biopolymer films and nanoparticles on different textile substrates for enhanced medical applications, diminishing the incidence of the multiple range of hospital-acquired infections in the past 10 years. The combination of metal and metal oxide nanoparticles with biopolymers is an efficient technique to generate enhanced antibacterial, virucidal and antifungal properties to textiles. Only a few review articles offer a comprehensive insight into the surface tailoring of textiles by nanoparticles-biopolymers use as an alternative for surface modification of textiles, granting them biocidal performance. The overview points out the compelling reasons for scientists and experts to enhance the already existing results in the biomedical textiles domain, with an emphasis on antimicrobial responsivity, highlighting: (a) the benefit of the simultaneous nanoparticles-biopolymers deposition on textiles by various deposition techniques, meaning the wash fastness of the antibacterial attributes and the biocompatibility of the material in comparison with only nanoparticle coating; (b) the use of biopolymers to stabilize colloidal dispersions of nanoparticles, granting the nanoparticles functionalities for covalent immobilization on textiles with long-lasting antibacterial effect; (c) the most usual metal and metal oxide nanoparticles and biopolymers for antibacterial textile applications.The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: The project was financed by Lucian Blaga University of Sibiu and Hasso Plattner Foundation research grants LBUS-IRG-2021-07.Vrinceanu, N.; Bucur, S.; Rimbu, CM.; Neculai-Valeanu, S.; Ferrándiz Bou, S.; Suchea, MP. (2022). Nanoparticle/biopolymer-based coatings for functionalization of textiles: recent developments (a minireview). Textile Research Journal. 92(19-20):3889-3902. https://doi.org/10.1177/00405175211070613388939029219-2

Synthesis and Characterisation of Ag/SnO2/Clay Nanocomposites with Potential Application as Photocatalysts

This work reported a novel synthesis and characterization of Ag/SnO2/clay nanocomposites. The obtained materials were characterized using techniques such as X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy, particles size distribution, BET analyses and Scanning Electron Microscopy. The Ag/SnO2/clay nanocomposites have been used as efficient and environmentally benign photocatalysts. The protocols developed using this kind of material is advantageous in terms of simple experimentation, reusable catalyst, excellent yields of the products, short reaction time and preclusion of toxic solvents. The synthesized nanosized AgSnO2/clay nanocomposites have been used as photocatalysts for degradation and discoloration of synthetic wastewater containing Eosin Y dye, xanthene fluorescent dye, under solar radiation

A Comparative Approach of Degradative Potential of Two Different Nanophotocatalysts onto a Model Textile Dye

Motivations and objectives. It is quite a difficult issue to treat, decolorize and mineralize textile dye waste containing dyes by conventional chemical methods (primary: adsorption, flocculation and secondary: chlorination, ozonization. It has been demonstrated that semiconductor photocatalytic oxidation of organic substances can be an alternative to conventional methods of removal of organic pollutants from water [1]. Advanced oxidation processes (AOPs) employing heterogeneous catalysis have emerged as a potentially destructive technology leading to the total mineralization of most of organic pollutants. An additional advantage of the photocatalytic process is its mild operating conditions and the fact the semiconductor can be activated by sunlight (near UV), thus reducing significantly the electric power requirement and hence the operating cost [2]. The main result and characterizing aspect of the research consist of the effectiveness of a semiconductor photocatalytic treatment of synthetic wastewater. Nanophotocatalysts ZnO have been successfully grown by hydrothermal method, onto some fibrous supports previously functionalized (grafted with MCT (monochlorotriazinyl-β-cyclodextrin, MCT-β-CD). The synthesis is reported elsewhere. The hydrothermal synthesis was performed using two types of surfactants widely used in nanoparticles preparation: Pluronic P123(triblock copolymer) and CTAB (cetyltrimethylammonium bromide). The novelty of the study consists in using these two different surfactants in growning of ZnO onto the fibrous supports. For degradation of Erionyl Roth dye, batch experiments were performed by irradiating the aqueous solution of model textile dye, containing ZnO nanocoated fibrous supports as semiconductor, in the presence of UV light. The photocatalytic process occurs under the illumination of an UV lamp, emitting light at wavelength 365 nm. The rate of decolorization was estimated spectrophotometrically from residual concentrations. Results and discussion. The enhancement of the photocatalytic activity is attributed to the CTAB. The performance of the photocatalytic system indicated that the photodegradation of the Erionyl Roth, in the presence of CTAB, occured with a 20 % reduction of time, compared to P123.The study has demonstrated that using the semiconductor performed by CTAB on the ZnO nano-oxides synthesized onto previously MCT grafted fibrous supports is effective in degradation of dyes as well as in the treatment of textile dye waste

Empirical Modeling of COVID-19 Evolution with High/Direct Impact on Public Health and Risk Assessment

This report develops a conceivable mathematical model for the transmission and spread of COVID-19 in Romania. Understanding the early spread dynamics of the infection and evaluating the effectiveness of control measures in the first wave of infection is crucial for assessing and evaluating the potential for sustained transmission occurring in the second wave. The main aim of the study was to emphasize the impact of control measures and the rate of case detection in slowing the spread of the disease. Non pharmaceutical control interventions include government actions, public reactions, and other measures. The methodology consists of an empirical model, taking into consideration the generic framework of the Stockholm Environment Institute (SEI) Epidemic–Macroeconomic Model, and incorporates the effect of interventions through a multivalued parameter, a stepwise constant varying during different phases of the interventions designed to capture their impact on the model. The model is mathematically consistent and presents various simulation results using best-estimated parameter values. The model can be easily updated later in response to real-world alterations, for example, the easing of restrictions. We hope that our simulation results may guide local authorities to make timely, correct decisions for public health and risk assessment

Numerical simulation and irreversibility analysis of nanofluid flow within a solar absorber duct equipped with a novel turbulator

This research presents an innovative alteration to the solar collector's design by integrating a 4-lobed tube with helical tape. The choice of a working fluid, a combination of water and alumina nanoparticles, is purposeful, aiming to reduce irreversibility. Extensive numerical simulations, along with thorough benchmark verification, meticulously assess the system's performance, demonstrating strong alignment with established benchmarks.This study delves into the interaction among pivotal parameters—D* (diameter ratio), Re (Reynolds number), and N (revolution number)—and their impact on essential performance metrics, encompassing ηII (second law performance), Xd (exergy drop), and Φx (exergy drop ratio). With the elevation of all three parameters, the intensified swirl flow facilitates improved heat absorption by the nanofluid, resulting in reduced entropy generation and subsequently, a decrease in exergy drop. More precisely, the increments in Re, N, and D* lead to significant reductions in the value of Xd, with approximately 52.1 %, 4.02 %, and 5.03 %, respectively. When N = 4, D*=0.02, the amount of ηII for Re = 2e4 is 8.38 times greater than that of Re = 4e3. Increasing D* and N leads to substantial improvements in ηII, with approximately 50.02 % and 30.15 % enhancements, respectively. The highest ηII, reaching 0.582, is attained when D*=0.048, N = 7, and Re = 2e4

Entropy Optimization and Thermal Behavior of a Porous System With Considering Hybrid Nanofluid

[EN] The aim of this research work is to study the performance of hybrid eclectically conducting nanofluid (MWCNT-Fe3O4) with entropy optimization impacts using the CVFEM approach. 3D and contour plots are two types of outcomes that extend the discrepancy of analyzed variables. The Newtonian liquid is presumed as a testing fluid, and the non-Darcy model is employed to simulate the permeable domain. The geometry has two adiabatic walls and one wavy hot wall with unvarying flux, and the other is kept at a constant temperature. The impact of Brownian motion in the hybrid nanofluid (MWCNT-Fe3O4) is considered. The irreversibility effect is also taken into account. This effect acts against the performance of the system and reduces the efficiency of the system. To solve the final equations with higher accuracy, we utilized the method of CVFEM. The validation of the results obtained through CVFEM is clearly and graphically presented with the available literature. The outputs of the simulation showed that there is an inverse relation between permeability and the Bejan Number, and the boundary layer thickness augments with intensification in Lorentz force. These variations in the form of streamline, isotherm, and various contour plots have been reported at Ra 103 and Ra 105 for different values of Da, Ha, and ¿.This project was financed by Lucian Blaga University of Sibiu and Hasso Plattner Foundation research grants LBUS-IRG-2021-07.Shah, Z.; Ullah, A.; Musa, A.; Vrinceanu, N.; Ferrándiz Bou, S.; Iqbal, S.; Deebani, W. (2022). Entropy Optimization and Thermal Behavior of a Porous System With Considering Hybrid Nanofluid. Frontiers in Physics. 10. https://doi.org/10.3389/fphy.2022.9294631

Blood Flow of Au-Nanofluid Using Sisko Model in Stenotic Artery with Porous Walls and Viscous Dissipation Effect

Nanofluids are extremely useful to investigators due to their greater heat transfer rates, which have significant applications in multiple industries. The primary objective of this article is to look into the effect of viscous dissipation in Sisko nano liquid flow with gold Au nanoparticles on a porous stenosis artery. Heat transfer properties were explored. Blood was utilized as a base fluid for nanoparticles. To renovate the governing nonlinear PDEs into nonlinear ODEs, appropriate transformations were used. The bvp4c-based shooting method, via MATLAB, was used to determine the numerical results of the nonlinear ODEs. Furthermore, flow forecasts for each physical quantity were explored. To demonstrate the physical influences of flow constraints versus presumed flow fields, physical explanations were used. The findings demonstrated that the velocity contour improved as the volume fraction, curvature, power law index, and material parameter upsurged. For the Prandtl number, the volume fraction of nanoparticles, the index of the power law, and the temperature profile of the nanofluid declined. Furthermore, the drag force and transfer of the heat were also investigated as explanations for influences on blood flow. Further, the Nusselt number reduced and the drag force enhanced as the curvature parameter values increased. The modeling and numerical solutions play an impressive role in predicting the cause of atherosclerosis